Declension table of ?kṛṣṇasūnu

Masculine	Singular	Dual	Plural
Nominative	kṛṣṇasūnuḥ	kṛṣṇasūnū	kṛṣṇasūnavaḥ
Vocative	kṛṣṇasūno	kṛṣṇasūnū	kṛṣṇasūnavaḥ
Accusative	kṛṣṇasūnum	kṛṣṇasūnū	kṛṣṇasūnūn
Instrumental	kṛṣṇasūnunā	kṛṣṇasūnubhyām	kṛṣṇasūnubhiḥ
Dative	kṛṣṇasūnave	kṛṣṇasūnubhyām	kṛṣṇasūnubhyaḥ
Ablative	kṛṣṇasūnoḥ	kṛṣṇasūnubhyām	kṛṣṇasūnubhyaḥ
Genitive	kṛṣṇasūnoḥ	kṛṣṇasūnvoḥ	kṛṣṇasūnūnām
Locative	kṛṣṇasūnau	kṛṣṇasūnvoḥ	kṛṣṇasūnuṣu

Compound kṛṣṇasūnu -

Adverb -kṛṣṇasūnu